It is metric not customary because the usa doesnt use it
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Doesn't it? Oh yes it is. Almost all of the rest of world does, I'll have you know!
And so do American engineers and scientists, especially when engaged in international projects.
A "gran" is a German measurement, it is neither customary or metric. A "gram" is a metric unit.
It can be more or less. An once (customary) is bigger than a gram (metric) but a pound (customary) is smaller than a kilogram (metric).
The ounce is a unit of measurement used in customary systems, particularly in the United States and other countries that follow the imperial system. In the metric system, the equivalent unit for measuring weight is the gram.
It is a customary unit.
The opposing systems are imperial and metric, not customary. But, meters are metric.
The pound is NOT a metric unit.
It is customary.
Ounces are an imperial unit. They are a bit confusing as they can be a volume unit or a mass unit. The metric equivalent would be gram or millilitre. About 30 gram = 1 oz About 30 mL = 1 fluid oz
Metric.
Metric.
Metric
It is a customary unit.